Double-drum hoist



March 9,19%.

F. M. SLATER DOUBLE DRUM HOIST Filed June 24, 1925 I INVENTORfiedJZQY/afefi E ms ATTbRzEY Patented Mar. 9, 1926.

UNITED STATES PATENT OFFICE.

FEED M. SLATER, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RANDOOM-PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY;

DOUBLE-DRUM I-IOIST.

Application filed June 24, 1925. Serial No. 39,167.

To all w/ZOWZ it may concern:

Be it known that I, Finn) M. SLATER, a citizen of the United States, anda resident of Easton, in the county of Northampton 5 and State ofPennsylvania, have invented a certain Double-Drum Hoist, of which thefollowing is a specification accompanied by drawings.

This invention relates to double drum hoists of. the type in which onedrum or the other is automatically connected to be driven from areversible motor in accordance with the direction of rotation of themotor.

In a hoist of this type, the drums are provided with drum drivers and amain driver. A. main driving head driven in one direction or the otherfrom the motor is provided with automatic clutch mechanism for connecting one drum driver or the other to the main driver. The main drivermay be located in different positions relatively to the drums and theclutch mechanism may be between the drums or may be located at one endof the drums and yet cooperate with the drum drivers on opposed portionsof the drums.

The objects of the present invention are to enable a rocking pawl orclutch member to be mounted on a main driver located at one 30 end ofthe drums so that the pawl may rock about an axis transverse to thelongitudinal axis of the machine and engage one drum driver or theother. By this construction the drums may be placed close together whichin some respects is an advantageous construction and prevents theaccumulation of dirt. and debris between the drums.

One preferred form of the invention is shown in the accompanyingdrawings, in which Figure 1 is a longitudinal sectional view of a doubledrum hoist,

Figure 2 is a sectional detail view showing the pawl mechanism in adifferent position, and

Figure 3 is a detail transverse sectional View partly broken away on theline 3-3 of Figure 1 looking in the direction of the arrows.

Referring to the drawings, any suitable reversible motor, as forinstance, an electric motor A may be mounted on the main frame B of thehoist which frame is provided with the standards C having a longitudinaldrum shaft D mounted therein. This shaft D may be either stationary orrevolvable as desired, in this instance the shaft being sta tionary. Thedrums E and F are rotatably mounted relatively to the shaft D. In thisinstance the drum E is keyed to the tubular shaft or sleeve G whichextends along the drum shaft 1) and is rotatable thereon and terminatesat one end in a drum driver H having the clutch teeth J directed orextending in a radial direction with reference to the drum shaft D oraxis of rotation.

' The other drum F is rotatably mounted on the tubular shaft or sleeve Gand it is to be understood that the sleeve G may, if desired, form anintegral part of the drum E, and the drum driver H may be removablysecured thereto as by means of a key (not shown). Any suitableconstruction may be provided whereby the drums may be removed from thedrum shaft D and may be separated from each other in dismantling thehoist.

The drum F is provided with the drum driver K in the form of ratchetteeth L extending in a radial direction but facing 0ppositely to theteeth J. The backs O of each set of teeth are bevelled in order tocooperate with the latch or pawl P carried by the main driver or maindriving head Q.

This main driver may be in the form of an internal gear R rotatablymounted on the drum shaft D and provided with the pawl carrier S boltedto the internal gear by means of the bolts T and extending into thespace between the drum drivers H and K. The pawl P is preferably securedto a pivot pin U as by means of the key or pin V which pivot pin U ispivotally mounted. in the pawl carrier S as shown in detail in Figure 3.One end of the pivot pin U is rifled at W and cooperates with a riflenut- X secured in a socket in the arm Y of the forked portion Z of thepawl carrier S by means of the pin a. The opposite end I) of the pivotpin U is pivoted in the opposite arm 0 of said forked portion of thepawl carrier S. The distance between the arms Y and 0 of the pawlcarrier is greater than the length of the pawl P so that as the pawlrocks back and forth. between the drum driver J and K the rifled end Wof the pivot pin may move longitudinally in the rifled socket X andinsure the complete movement of the pawl into engagement with the0pposite, drum driver.

In the operation of the device, the driving motor A may be rotated inone direction or the other as desired to cause one drum or the other tobecome the haulage drum operatively connected to the motor. Theremaining drum is then idle and becomes the tail rope drum as is wellunderstood. If the pawl P is in engagement with drum driver teeth J forone drum when the motor is being rotated in one direction, the reversalof rotation of the drum driver will cause the backs of the teeth J andthe action of the rifle bar to rock the pawl on its pivot intoengagement with the teeth L of the opposite drum driver and thisoperation will be automatically carried out in accordance with thereversal of the motor.

I claim: I

1. In a hoist, the combination of'a main shaft, standards for supportingsaid main shaft, a pair of drums rotatable about said main shaft,opposed drum drivers at one end of one drum and adapted to rotatethrough different transverse planes, a main driver at one end of theshaft and connected to be rotated by a reversible source of power, and apawl carried by the main driver for connecting one or the other of thedrums with the main driver in accord ance with the direction of rotationof said main driver.

2. In a hoist, the combination of a main shaft, standards for supportingsaid main shaft, a pair of drums rotatable about said main shaft, a maindriver rotatable on one end of the main shaft and connected to be drivenby a reversible source of power, opposed druni drivers between the maindriver and one of the drums and associated with the driins, said drumdrive-rs being rotatable through different transverse planes, a pawlcarrier between the opposed drivers and secured to the main driver, andan oscillatory pawl pivoted to the pawl carrier tocooperate with thedrum drivers for connecting one or the other of the drums with the maindriver in accordance with the direction of rotation of said main driver.

In testimony whereof I have signed this specification.

FRED M. SLATER.

